Photosynthesis of maize palnt differ from wheat plant in

Options

A. Number of ATP reqired per `CO_(2)` fixation
B. Having spatial soparation in both carboxylations
C. Having PEP case activity
D. All of these

Answer

**Step-by-Step Solution:**

1. **Identify the Types of Plants:**
- Maize is classified as a C4 plant.
- Wheat is classified as a C3 plant.

2. **Understanding CO2 Fixation:**
- In C4 plants (like maize), CO2 fixation occurs in two stages: first in the mesophyll cells and then in the bundle sheath cells. This process requires more ATP because it involves two separate steps of carbon fixation.
- In C3 plants (like wheat), CO2 fixation occurs only once in the mesophyll cells, which requires less ATP.

3. **ATP Requirement:**
- C4 plants require more ATP for CO2 fixation due to the dual fixation process.
- C3 plants require less ATP as they perform a single fixation process.

4. **Separation of Carboxylation:**
- In C4 plants, there is spatial separation of the carboxylation process, occurring in both mesophyll and bundle sheath cells.
- In C3 plants, the carboxylation occurs only in the mesophyll cells.

5. **Enzymatic Differences:**
- C4 plants utilize the enzyme PEP carboxylase (PAP case) for the initial fixation of CO2 in the mesophyll cells.
- C3 plants utilize the enzyme RuBisCO for CO2 fixation.

6. **Conclusion:**
- The differences in photosynthesis between maize and wheat can be summarized as follows:
- Maize (C4) requires more ATP, has spatial separation of carboxylation, and uses PEP carboxylase.
- Wheat (C3) requires less ATP, has carboxylation occurring only in mesophyll cells, and uses RuBisCO.

**Final Answer:**
Photosynthesis of maize (C4 plant) differs from wheat (C3 plant) in terms of ATP requirement, carboxylation separation, and the type of enzyme used for CO2 fixation.

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